First Utility’s iSave Fixed May 2015 works out at an average £1.013 for a year’s worth of gas and electricity.

However, the deal comes with a sting in the tail as customers will have to stump up £30 per fuel to switch supplier early.

Nevertheless Tom Lyon, energy expert at price comparison website uSwitch.com, said: “I strongly urge the big six to join in this contest and up their game if they want to hold onto their customers who could very easily be lured away by competitive prices and a fresh start.”

Ecotricity says it’s able to extend the price freeze because it’s able to rely on more of its own power thanks to a record year for wind power in 2013, plus savings as number of customers passed the 100,000 mark.